The Open UniversitySkip to content
 

Spectroscopic studies of extremely metal-poor stars with the subaru high-dispersion spectrograph. IV. The alpha-element-enhanced metal-poor star bs 16934-002

Aoki, W.; Honda, S.; Beers, T. C.; Takada-Hidai, M.; Iwamoto, N.; Tominaga, N.; Umeda, H.; Nomoto, K.; Norris, J. E. and Ryan, S. G. (2007). Spectroscopic studies of extremely metal-poor stars with the subaru high-dispersion spectrograph. IV. The alpha-element-enhanced metal-poor star bs 16934-002. Astrophysical Journal, 660(1) pp. 747–761.

URL: http://www.iop.org/EJ/abstract/0004-637X/660/1/747
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1086/512601
Google Scholar: Look up in Google Scholar

Abstract

detailed elemental abundance analysis has been carried out for the very metal-poor (Fe/H = -2.7)star BS 16934-002, which was identified in our previous work as a star exhibiting large overabundances of Mg and Sc. A comparison of the abundance pattern of this star with that of the well-studied metal-poor star HD 122563 indicates excesses of O, Na, Mg, Al, and Sc in BS 16934 002. Of particular interest, no excess of C or N is found in this object, in contrast to CS 22949-037 and CS 29498-043, two previously known carbon-rich, extremely metal-poor stars with excesses of the alpha-elements. No established nucleosynthesis model exists that explains the observed abundance pattern of BS 16934-002. A supernova model, including mixing and fallback and assuming severe mass loss before explosion, is discussed as a candidate progenitor of BS 16934-002.

Item Type: Journal Article
ISSN: 1538-4357
Academic Unit/Department: Science > Physical Sciences
Item ID: 15562
Depositing User: Colin Smith
Date Deposited: 24 Apr 2009 09:04
Last Modified: 02 Dec 2010 20:26
URI: http://oro.open.ac.uk/id/eprint/15562
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk